Added Buy Credits section to Managing Airbyte Cloud (#13905)

* Added Buy Credits section to Managing Airbyte Cloud

* Made some style changes

* Made edits based on Natalie's suggestions

* Deleted link

* Deleted line

* Edited email address

* Updated reaching out to sales sentence

docs/cloud/managing-airbyte-cloud.md

@@ -70,3 +70,41 @@ Understanding the following limitations will help you better manage Airbyte Clou
 * Size of a single record: 100MB
 * Shortest sync schedule: Every 60 min
 * Schedule accuracy: +/- 30 min
+
+## Buy Credits
+
+This section guides you through purchasing credits on Airbyte Cloud. An Airbyte [credit](https://docs.airbyte.com/cloud/core-concepts/#credits) is a unit of measure used to pay for Airbyte resources when you run a sync. See [Pricing](https://airbyte.com/pricing) for more information.
+
+ To buy credits:
+
+1. On the [Airbyte Cloud](http://cloud.airbyte.io) dashboard, click the **star icon**.
+
+    The Credits page displays.
+
+2. If you are unsure of how many credits you need, click **Talk to sales** to find the right amount for your team.
+
+3. Click **Buy credits**. The Stripe payment page displays.
+
+4. If you want to change the amount of credits, click Qty **200**. **Update quantity** displays, and you can either type the amount or use minus (**-**) or plus (**+**) to change the quantity. Click **Update**. 
+
+    :::note 
+    Purchase limits:
+    * Minimum: 100 credits
+    * Maximum: 999 credits
+    :::
+
+    To buy more credits or a subscription plan, reach out to [Sales](https://airbyte.com/talk-to-sales).
+
+5. Fill out the payment information.
+
+6. Click **Pay**.
+
+    Your payment is processed, and the Credits page displays the updated quantity of credits, total credit usage, and the credit usage per connection. 
+
+    A receipt for your purchase is sent to your email. [Email us](mailto:ar@airbyte.io) for an invoice.
+
+    :::note 
+
+    Credits expire after one year if they are not used.
+
+    :::